Seat frame assembly

ABSTRACT

A seat frame assembly is disclosed to include a base frame, which has two extension bars arranged in parallel at two sides, a back frame, which has a pivot axle transversely disposed on the middle and pivotally coupled between the extension bars of the base frame, and two support members coupled between two transversely extending bottom connection tubes of the base frame and the pivot axle of the back frame.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to seat frame structures and more particularly to a seat frame assembly, which has a pivoted back frame that prevents stress concentration when supporting the back of the user sitting on the seat frame assembly.

2. Description of the Related Art

A conventional seat or chair generally comprises a seat frame structure formed of wooden bars or metal bars, and covering members covering the seat frame structure and stuffed of a soft or flexible stuffing material. This design of seat or chair has drawbacks. Because the wooden bar or metal bars are fixedly connected to one another, the tilting angle of the back of the seat or chair is not adjustable to fit the user's back in different tilting angles. Further, the wooden bars or metal bars do not facilitate ventilation. These drawbacks are more apparent when the seat frame structure is used in a legless chair or traditional Japanese seat.

SUMMARY OF THE INVENTION

The present invention has been accomplished under the circumstances in view. It is the main object of the present invention to provide a seat frame assembly, which allows free adjustment of the back frame to fit the tilting angle of the user's back. It is another object of the present invention to provide a seat frame assembly, which facilitates ventilation.

To achieve these and other objects of the present invention, the seat frame assembly comprises a base frame, which has two extension bars arranged in parallel at two sides, a back frame, which has a pivot axle transversely disposed on the middle and pivotally coupled between the extension bars of the base frame, and two support members coupled between two transversely extending bottom connection tubes of the base frame and the pivot axle of the back frame. Further, the base frame and the back frame each are comprised of two side frame plates and a plurality of connection tubes connected between the side frame plates. The connection tubes facilitate ventilation.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an exploded view of a seat frame assembly in accordance with the present invention.

FIG. 2 is an elevational assembly view of the seat frame assembly in accordance with the present invention.

FIG. 3 is a schematic drawing of the present invention, showing covering members covered on the seat frame assembly.

FIG. 4 is a schematic drawing of the present invention, showing the back frame tilted relative to the base frame and the support members.

FIG. 5 illustrates the base frame of the seat frame assembly affixed to a stand according to the present invention.

FIG. 6 is a sectional side view of the seat frame assembly in accordance with the present invention.

FIG. 7 is a schematic rear side view of the present invention, showing the distribution of the bearing points.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

Referring to FIGS. 1-4, a seat frame assembly in accordance with the present invention is shown comprised of a base frame 10, a back frame 20, and two support members 30.

The base frame 10 comprises two side frame plates 11 arranged in parallel at two sides, each side frame plate 11 having a plurality of mounting holes 13 arranged in line, two extension bars 12 respectively formed integral with and extending from the side frame plates 11, each extension bar 12 having a pivot hole 14 at the distal end, a plurality of first connection tubes 15 and two second connection tubes 150 respectively coupled between the mounting holes 13 of the two side frame plates 11 and arranged in parallel, and two locating blocks 16 respectively fixedly mounted on the two second connection tubes 150 at the rear side of the base frame 10.

The back frame 20 comprises two side frame plates 21 arranged in parallel at two sides, each side frame plate 21 having a plurality of mounting holes 22 spaced along the length and a pivot hole 23 on the middle, a plurality of connection tubes 24 respectively connected between the mounting holes 22.of the two side frame plate 21, a pivot axle 25 mounted in the pivot holes 14 of the extension bars 12 of the base frame 10 and the pivot holes 23 of the side frame plates 21 of the back frame 20 to pivotally secure the back frame 20 to the base frame 10, and a locating block 26 affixed to the pivot axle 25 on the middle.

The support members 30 each have a top end respectively provided with a pivot hole 32 and pivotally coupled to the pivot axle 25 of the back frame 20 and stopped at one end of the locating block 26 at the pivot axle 25, and a bottom end coupled to the two second connection tubes 150 of the base frame 10 and respectively stopped against the two distal ends of the locating blocks 16 at the second connection tubes 150 of the base frame 10. Further, connection tubes 31 are connected between the two support members 30.

Referring to FIG. 3 again, covering members 40˜43 are covered on the base frame 10, the back frame 20 and the support members 30. The covering members 40 and 42 that cover the base frame 10 and the back frame 20 can be formed of a cloth or leather covering stuffed with sponge or foamed rubber. The covering member 41 for the side frame plates 11 and extension bars 12 of the base frame 10 can be an elastomer (ethylene vinyl acetate or rubber) directly molded on the side frame plates 11 and extension bars 12 of the base frame 10. The covering member 43 for the support members 30 can a flexible plastic sheath directly sleeved onto the support members 30.

Further, the locating blocks 16 that are affixed to the second connection tubes 150 of the base frame 10 prohibit the support members 30 from sliding along the second connection tubes 150.

Referring to FIGS. 4 and 5, the invention can be made in the form of a legless chair or traditional Japanese chair, as shown in FIG. 4. Alternatively, a stand 50 can be fastened to the bottom side of the base frame of the seat frame assembly to form a chair, as shown in FIG. 5. When the user is sitting on a chair based on the seat frame assembly of the present invention with the back rested on the back frame of the seat frame assembly, the back frame of the seat frame assembly is turnable with the pivot axle relative to the base frame to support the user's back comfortably. Further, the connection tubes of the seat frame assembly facilitate ventilation.

Referring to FIGS. 6 and 7, the pivot axle 25 has its two distal ends respectively pivoted to the pivot holes 14 of the extension bars 12 of the base frame 10, and therefore the pivot holes 14 of the extension bars 12 work as two bearing points D1 and D2 to support the pivot axle 25; the pivot holes 32 of the support members 30 are respectively coupled to the pivot axle 25 of the back frame 20, and therefore two bearing points D3 and D4 are disposed at the pivot axle 25 to support the support members 30; the pivot holes 23 of the side frame plates 21 of the back frame 20 are coupled to the pivot axle 25, and therefore two bearing points D5 and D6 are disposed at the pivot axle 25 to support the side frame plates 21 of the back frame 20. By means of the effect of the 6 bearing points D1˜D6, any pressure applied to the back frame 20 is evenly distributed in all directions, preventing stress concentration.

Although a particular embodiment of the invention has been described in detail for purposes of illustration, various modifications and enhancements may be made without departing from the spirit and scope of the invention. Accordingly, the invention is not to be limited except as by the appended claims. 

1. A seat frame assembly comprising: a base frame, said base frame comprising comprises two side frame plates arranged in parallel at two sides, the side frame plates of said base frame each having a plurality of mounting holes arranged in line, two extension bars respectively formed integral with and extending from the side frame plates of said base frame, said extension bars each having a pivot hole at a distal end thereof, a plurality of first connection tubes and two second connection tubes respectively coupled between the mounting holes of the two side frame plates of said base frame and arranged in parallel at front and rear sides of said base frame, and two locating blocks respectively fixedly mounted on the two second connection tubes at the rear side of said base frame. a back frame, said back frame comprising two side frame plates arranged in parallel at two sides, the side frame plates of said back frame each having a plurality of mounting holes spaced along the length thereof and a pivot hole on a middle thereof, a plurality of connection tubes respectively connected between the mounting holes of the two side frame plate of said back frame, a pivot axle mounted in the pivot holes of said extension bars of said base frame and the pivot holes of the side frame plates of said back frame to pivotally secure said back frame to said base frame, and a locating block affixed to a middle part of said pivot axle; and two support members connected in parallel with connection tubes, said support members each having a top end pivotally coupled to said pivot axle of said back frame and respectively stopped at two opposite ends of the locating block at said pivot axle, and a bottom end coupled to the two second connection tubes of said base frame and respectively stopped against two distal ends of each of the locating blocks at the second connection tubes of said base frame. 